A parallel plate air capacitor has capacity C , distance of separation between plates is d and potential…

A parallel plate air capacitor has capacity C, distance of separation between plates is d and potential difference V is applied between the plates. The force of attraction between the plates of the capacitor is
  1. CV22d.
  2. CV2d.
  3. C2V22d2.
  4. C2V22d.

Solution

Attraction force between the plates,
F=q22Aε0 where q=CV and C=ε0Ad
⇒F=C2V22Cd=CV22d

Asked in: NEET 2015 (Phase 2)

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